ISO 760:1978 水的测定.卡尔费希尔（KarlFischer）法（一般方法）

标准编号：ISO 760:1978

中文名称：水的测定.卡尔费希尔（KarlFischer）法（一般方法）

英文名称：Determination of water — Karl Fischer method (General method)

发布日期：1978-12

标准范围

规定了两种滴定方法，取决于终点是通过目测还是通过电测法检测。目视法仅适用于无色溶液，但在没有电测仪器的情况下可使用。无论是直接滴定法还是反滴定法，电测法都更准确，因此建议使用。该试验的原理是，将试验部分中的任何水与吡啶/甲醇混合物（卡尔·费歇尔试剂）中的碘和二氧化硫溶液反应，该混合物之前通过滴定法与精确已知质量的水进行标准化。

Two methods of titration depending on whether the end point is detected visually or electrometrically are specified. The visual method is only applicable to colourless solutions but can be used when no electrometric apparatus is available. The electrometric method, whether by direct titration or back-titration, is the more accurate one and for this reason recommended. The principle of the test consists in reaction of any water present in a test portion with a solution of iodine and sulphur dioxide in a pyridine/methanol mixture (Karl Fischer reagent), previously standardized by titration with an exactly known mass of water.

标准预览图